USGS WPhase Moment Solution

OFF EAST COAST OF HONSHU, JAPAN

11/ 7/10  0:57:12.00

Epicenter:  38.040  143.287
MW 7.0

USGS/WPHASE CENTROID MOMENT TENSOR
11/ 7/10  0:57:12.00
Centroid:   37.640  143.414
Depth  23         No. of sta: 55
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.30       Mtt=-2.40
  Mpp= 2.10       Mrt=-0.05
  Mrp= 1.95       Mtp= 1.74
 Principal axes:
  T  Val=  3.70  Plg=28  Azm=285
  N     = -0.55      57      134
  P     = -3.15      13       23

Best Double Couple:Mo=3.5*10**19
 NP1:Strike= 68 Dip=60 Slip=  12
 NP2:       332     80       149

Moment Tensor Solution
The figure above shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. Shaded areas show quadrants of the focal sphere in which the P-wave first-motions are away from the source, and unshaded areas show quadrants in which the P-wave first-motions are toward the source. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake.

Moment Tensor Solution

Details on the W-phase inversion algorithm.